Family name Gahagan (Gahagan 
) , in the entire world, is quite a rare last name. The cognomen Gahagan is habitual in the United States, where it is a rare surname, the United Kingdom, and Canada. Much less frequently, Gahagan is the forename as well as the last name.
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| Gahagan | Canada, Australia, United States, United Kingdom, South Africa |
| lawrence gahagan irish-born sculptor (b. 1735) |
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| lawrence gahagan British artist (active 1756-1820), GB (b. 1756) |
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| sebastian gahagan Irish sculptor (b. 1779) |
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| vincent gahagan (b. 1776) |
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| dennis gahagan American settler (b. 1817) |
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helen gahagan American actress and politician, US (b. 1900) |
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| walter h. gahagan American civil engineer and construction contractor, US (b. 1864) |
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| george m. gahagan American politician, US (b. 1878) |
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| james gahagan American artist, US (b. 1927) |
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| john gahagan Scottish footballer (born 1958), GB (b. 1958) |
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| jim gahagan college basketball player (1951–1953) |
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| maria lucy gahagan Peerage person ID=614747 |
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| thomas gahagan Peerage person ID=432462 |
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| jacqueline c gahagan researcher |
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| terence gahagan Peerage person ID=704628 |
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